Ecology of consumption. Estate: Heat loss is a serious problem that construction science is struggling with. Effective insulation, sealed windows and doors solve it only partially. Heat leakage through walls, windows, roofs and floors can be significantly reduced. Despite this, energy still has one more wide path to “escape.” This is ventilation, which is impossible to do without in any building.

Heat loss is a serious problem that construction science is struggling with. Effective insulation, sealed windows and doors only partially solve this problem. Heat leakage through walls, windows, roofs and floors can be significantly reduced. Despite this, energy still has one more wide path to “escape.” This is ventilation, which is impossible to do without in any building.

It turns out that in winter we spend precious fuel on heating rooms and at the same time continuously throw heat outside, letting in cold air.

The problem of energy saving can be solved using a heat recuperator. In this device, warm indoor air heats outdoor air. This achieves considerable savings on heating costs (up to 25% of the total cost).

IN summer period, when it’s hot outside and the air conditioner is running in the house, the recuperator also brings benefits. It cools the hot incoming stream, reducing air conditioning costs.

Let's take a closer look at household heat recovery units in order to have an idea of ​​their design, advantages and features of choice.

Types, principle of operation and design of recuperators

The idea of ​​using the heat from indoor air to heat outdoor air turned out to be very fruitful. It was the basis for the operation of all recuperators.

Today, three types of such devices are used:

• lamellar;
• rotary;
• recirculating water.

The most common and simplest in design are plate recuperators. They are non-volatile, compact, reliable in operation and have a fairly high efficiency (40-65%).

The main working part of such a device is a cassette, inside of which parallel plates are installed. The air leaving and entering the room is cut by them into narrow streams, each of which goes through its own channel. Heat exchange occurs through the plates. Street air is heated, and indoor air cools and is released into the atmosphere.

Operating principle of a plate recuperator

The main disadvantage of plate installations is freezing in severe frosts. Condensate settling in the recovery unit turns into ice and sharply reduces the performance of the device. Three ways have been found to combat this phenomenon.

The first is installing a bypass valve. Having received a signal from the sensor, it allows a cold flow to bypass the block. Only warm air passes through the plates, defrosting the ice. After defrosting and draining the condensate, the valve restores normal operation of the system.

The second option is to use plates made of hygroscopic cellulose. Water settling on the walls of the cassette is absorbed into them and penetrates into the channels through which the supply air moves. This solves two problems at once: eliminating condensation and humidification.

The third method is to preheat the cold stream to a temperature that prevents the water from freezing. To do this, the server ventilation duct install heating element. The need for it arises when the outside air temperature is below -10C.

IN recent years Plate reversible units appeared on the market. Unlike direct-flow devices, they operate in two steps: the first is the release of warm air into the street, the second is the suction of cold air through a heated block.

Operating principle of reversible installation

Another type of installation is rotary recuperators. The efficiency of such devices is significantly higher than that of plate devices (74-87%).

The operating principle of the rotary unit is to rotate a cassette with cells in the flow of incoming and outgoing air. Moving in a circle, the channels alternately pass warm internal and cold external flows. In this case, the moisture does not freeze, but saturates the supply air.

It should be noted that the air handling unit with a recuperator rotary type allows you to smoothly regulate heat transfer. This is done by changing the rotation speed of the cassette. The main disadvantage of rotary systems is the high cost of maintenance. In terms of reliability, they are also inferior to plate ones.

The next type is recirculation water installation. It is the most complex in design. Heat transfer here is not carried out through the plates or rotor, but with the help of antifreeze or water.

The first liquid-air heat exchanger is installed on exhaust duct, and the second is on the suction. The work is carried out according to the principle of a heater: indoor air heats water, and it heats outdoor air.

The efficiency of such a system does not exceed that of plate recuperators (50-65%). The high price that one has to pay for the complexity of the design is justified by the only advantage: the units of such an installation can be placed not in one building, but in supply areas remote from each other. exhaust ventilation. For powerful industrial systems this has great value. Such devices are not installed in small buildings.

Features of choosing a recuperator

Having become familiar with the operating features of recuperation units, it’s time to move on to the practical part – the selection criteria for performing specific tasks.

The first thing you need to pay attention to is the installation method. IN working position Domestic supply and exhaust ventilation with heat recovery can be installed in several ways:

• Inside the wall. The housing is mounted in a pre-drilled hole. WITH outside a cap is installed, and on the inside there is a grille and a control unit.

• Indoors. The installation is hung on the wall. A grille or cap is placed outside.

• Outdoor placement. The advantages of this solution are obvious: minimal noise and space saving. The duct design of the device allows it to be placed on balconies and loggias, as well as simply on the facade of a building.

Another parameter that needs to be taken into account when purchasing is the number of fans. Budget air recuperators for the home are equipped with one ventilation unit that operates for both supply and exhaust.

More expensive devices have 2 fans. One of them pumps in and the other exhausts air. The performance of such devices is higher than that of single-fan devices.

When purchasing, you should also pay attention to the presence of an electric heater. With its help, freezing of the cassette is prevented and the lower temperature limit device operation.

Climate control function. Allows you to accurately set the temperature to which the recuperator will heat the air.

Possibility of humidity control. This parameter significantly affects the comfort of the microclimate. A standard recuperator dries the air, removing moisture from it.

Presence or absence of a filter. An additional option that has a positive effect on the sanitary characteristics of the air mixture.

An important parameter that requires attention is the temperature of the pumped air. IN different models its meaning may vary significantly. The widest range of operating temperatures from -40 to +50С household devices is rare.

Therefore, in addition to taking into account the optimal performance in m3/hour, when purchasing, choose a device that can fully operate in your climatic conditions.

Performance calculation

Detailed calculations of the operation of recuperators in the system supply and exhaust ventilation quite complex. Here we have to take into account many factors: the frequency of air exchange in the premises, the cross-section of the channels, the speed of air movement, the need to install mufflers, etc. Only experienced engineers can competently perform such a task.

The average consumer can use a simplified method to correctly navigate when purchasing a device.

The performance of the recuperator directly depends on the sanitary standard of air flow per person. Its average value is 30 m3/hour. Therefore, if 4 people permanently live in an apartment or private house, then the installation productivity should be at least 4x30 = 120 m3/hour.

The own electrical power of household recuperators is small (25-80 W). It is determined by the level of energy consumption duct fans. In installations with electric heating of the incoming flow, heating elements with a total power of 0.8 to 2.0 kW are installed.

Popular brands and approximate prices

When choosing a household recuperator, you should focus on manufacturers and models that have earned high customer ratings. As an example, we can cite the products of foreign companies Electrolux (Electrolux), Mitsubishi (Mitsubishi), Marley (Marley).

Recuperator for small spaces Mitsubishi Electric VL-100EU5-E. Air consumption 105 m3/h. Price from 21,000 rub.

Popular model from Electrolux. Estimated retail price from 42,000 rubles.

2017 price tags for domestic installations for these brands start at 22,000 rubles and end at 60,000 rubles.

MARLEY MENV-180. Air consumption 90 m3/hour. Cost from 27,500 rub.

The equipment of Russian and Ukrainian companies Vents (Vents), Vakio (Vakio), Prana and Zilant has proven itself well. Not inferior to foreign analogues in performance and reliability, they are often more affordable.

Installation of Vakio. Capacity 60 m3/h in recovery mode, up to 120 m3/h in supply ventilation. Price from 17,000 rub.

The estimated cost of air recovery systems from these companies (capacity from 120 to 250 m3/hour) ranges from 17,000 to 55,000 rubles.

Prava 200G. Inflow - 135 m3/h, exhaust - 125 m3/h. The recommended area for servicing the system is up to 60 m2.

The nature of reviews about air recuperators is mostly positive. Many owners note that with their help, the problem of excess humidity, which caused the appearance of mold and mildew in the premises, was solved.

In calculations of the payback period for this equipment, figures from 3 to 7 years are given. Instrumental measurement data regarding real savings We did not find any energy resources on forums dedicated to this topic.

Briefly about self-assembly

In most photos and video instructions for self-production plate models are considered for recuperators. This is the simplest and affordable option for the home handyman.

The main part of the structure is the heat exchanger. It is made from galvanized steel, cutting it into plates measuring 30x30 cm. To create channels, glue on the edges and in the middle of each section using silicone. plastic strips 4 mm thick and 2-3 cm wide.

The heat exchanger is assembled by placing and alternately rotating the plates at an angle of 90 degrees relative to each other. This creates isolated channels for the oncoming movement of cold and warm air.

After this, a housing made of metal, chipboard or plastic is made to fit the dimensions of the heat exchanger. There are four holes in it for air supply. Fans are installed in two of them. The heat exchanger is rotated at an angle of 45 degrees and secured in the housing.

The work is completed by thoroughly sealing all installation joints with silicone.

It is well known that there are several types of room ventilation systems. The most widespread natural ventilation when the inflow and outflow of air is carried out through ventilation shafts, open vents and windows, as well as through cracks and leaks in structures.

Of course, natural ventilation is necessary, but its operation is associated with a lot of inconveniences, and it is almost impossible to achieve cost savings with its installation. Yes, and calling the movement of air through slightly open windows and doors ventilation is a stretch - most likely, it will be ordinary ventilation. To achieve the required intensity of circulation of air masses, windows must be open around the clock, which is unattainable in the cold season.

That is why a more correct and rational approach is considered to be a forced or mechanical ventilation. Sometimes without forced ventilation it is simply impossible to get by, most often they resort to its arrangement in production premises with deteriorated working conditions. Let's leave industrialists and production workers aside and turn our attention to residential buildings and apartments.

Often, in pursuit of savings, cottage owners country houses or apartments, they invest a lot of money in insulating and sealing the housing and only then realize that due to the lack of oxygen it is difficult to stay in the room.

The solution to the problem is obvious - you need to arrange ventilation. The subconscious mind tells you that the best option There will be an energy-saving ventilation device. The lack of properly designed ventilation can cause your home to turn into a real gas chamber. This can be prevented by choosing the most rational decision– forced-exhaust ventilation device with heat and moisture recovery.

Recovery means its preservation. The outgoing air flow changes the temperature (heats, cools) the supplied air by the supply and exhaust unit.

The design assumes separation of air flows to prevent their mixing. However, when using a rotary heat exchanger, the possibility of the exhaust air flow entering the incoming air flow cannot be excluded.

The “Air Recuperator” itself is a device that provides heat recovery from exhaust gases. Heat exchange occurs through the dividing wall between the coolants, while the direction of movement of the air masses remains unchanged.

The most important characteristic of a recuperator is determined by the recuperation efficiency or efficiency. Its calculation is determined from the ratio of the maximum possible heat received and the actual heat received behind the heat exchanger.

Coefficient useful action recuperators can fluctuate in a wide range - from 36 to 95%. This indicator is determined by the type of recuperator used, the speed of air flow through the heat exchanger and the temperature difference between the exhaust and incoming air.

Types of recuperators and their advantages and disadvantages

There are 5 main types of air recuperators:

• Lamellar;
• Rotary;
• With intermediate coolant;
• Chamber;
• Heat pipes.

Lamellar

A plate recuperator is characterized by the presence of plastic or metal plates. Outgoing and incoming flows pass through different sides heat-conducting plates without contacting each other.

On average, the efficiency of such devices is 55-75%. A positive characteristic is the absence of moving parts. The disadvantages include the formation of condensation, which often leads to freezing of the recuperative device.

There are plate heat exchangers with moisture-permeable plates that ensure the absence of condensation. The efficiency and principle of operation remain unchanged, the possibility of freezing of the heat exchanger is eliminated, but at the same time the possibility of using the device to reduce the level of humidity in the room is also excluded.

Rotary

In a rotary recuperator, heat is transferred using a rotor that rotates between the supply and exhaust ducts. This device is characterized high level Efficiency (70-85%) and reduced energy consumption.

The disadvantages include minor mixing of flows and, as a result, the spread of odors, large number complex mechanics, which complicates the maintenance process. Rotary heat exchangers are effectively used for drying rooms, so they are an ideal option for installation in swimming pools.

Recuperators with intermediate coolant

In recuperators with an intermediate coolant, water or a water-glycol solution is responsible for heat transfer.

The exhaust air provides heating of the coolant, which, in turn, transfers heat to the incoming air flow. Air flows do not mix, the device is characterized by a relatively low efficiency (40-55%), usually used in industrial premises with a large area.

Chamber recuperators

A distinctive feature of chamber recuperators is the presence of a damper that divides the chamber into two parts. High efficiency (70-80%) is achieved due to the ability to change the direction of the air flow by moving the damper.

Disadvantages include slight mixing of flows, transmission of odors and the presence of moving parts.
Heat pipes are a whole system of tubes filled with freon, which evaporates when the temperature rises. In another part of the tubes, the freon cools to form condensation.

The advantages include the elimination of mixing of flows and the absence of moving parts. Efficiency reaches 65-70%.

It should be noted that previously, due to their significant dimensions, recuperative units were used exclusively in production; now the construction market offers recuperators with small dimensions that can be successfully used even in small houses and apartments.

The main advantage of recuperators is the absence of the need for air ducts. However, this factor can also be considered as a disadvantage, since for efficient work Sufficient removal between exhaust and supply air is required, otherwise fresh air is immediately drawn out of the room. The minimum permissible distance between opposite air flows should be at least 1.5-1.7 m.

Why is moisture recovery needed?

Moisture recovery is necessary to achieve a comfortable ratio of humidity and room temperature. A person feels best at a humidity level of 50-65%.

During the heating period, the already dry winter air loses even more moisture due to contact with the hot coolant, often the humidity level drops to 25-30%. With this indicator, a person not only feels discomfort, but also causes significant harm to his health.

In addition to the fact that dry air has negative influence on a person’s well-being and health, it also causes irreparable damage to furniture and carpentry made of natural wood, as well as paintings and musical instruments. Some may say that dry air helps get rid of dampness and mold, but this is far from true. Such shortcomings can be overcome by insulating the walls and installing high-quality supply and exhaust ventilation while maintaining a comfortable level of humidity.

Heat recovery has become quite often used recently in ventilation systems. If we consider the process itself in more detail, we must first decide and understand what the term recovery itself means. Heat recovery in ventilation systems means that the air being passed through, which is removed by special installations, is passed through a filter system and supplied back.

Worth paying special attention due to the fact that in ventilation systems, with a share of exhaust air, part of the heat is also drawn out of the room. And this is exactly this one thermal energy and comes back.

These systems are effectively used in large production facilities and large workshops, because to ensure optimal temperature For such premises in winter you need to expose yourself to great expenses. These installations can significantly compensate for such losses and reduce costs.

Even in a private home, ventilation units with heat recovery will be quite relevant today. Even in individual house Ventilation is always carried out and when air circulates, heat also leaves any room. Agree that it is simply impossible to seal the building completely and thereby avoid any heat loss.

Today, these systems should be used even in a private home for the following reasons:

• For quick removal of air with a large admixture of carbon dioxide;
• For influx required quantity fresh air to residential premises;
• To eliminate high humidity in rooms, as well as eliminate unpleasant odors;
• To save heat;
• And also to remove dust and harmful microorganisms that may be contained in it.

Supply air systems with recovery

An air handling unit with heat recovery is beginning to be in increasing demand among private homeowners. And its advantages, especially in the cold season, are very high.

As you know, there are many ways to provide a living space with the necessary ventilation. This is also natural air circulation, which is mainly carried out by ventilating rooms. But you must admit that it is simply impossible to use this method in winter, since all the heat will quickly leave the living quarters.

If in a house in which air circulation is carried out only naturally there is no more effective system, it turns out that in cold weather the rooms do not receive the required volume of fresh air and oxygen, which subsequently negatively affects the well-being of all family members.

Of course, recently, when almost all owners install plastic windows and doors, it turns out that we need to arrange ventilation in a natural way It's just ineffective. Therefore, there is a need to install additional equipment, which can ensure good air circulation indoors. And, of course, every owner will agree that they would like any system to use energy sparingly.

And here the best option would be heat recovery in ventilation systems. IN ideal It is advisable to purchase a unit that could also provide humidity recovery.

What is moisture recovery?

Any room should always maintain a certain level of humidity at which each person feels most comfortable. This norm ranges from 45 to 65%. In winter, most people experience excessively dry indoor air. Especially in apartments, when the heating is turned on full and the air becomes very dry with a humidity of about 25%.

In addition, it often turns out that not only humans suffer from such changes in humidity. But also floors with furniture, as we know, wood has high hygroscopicity. Very often, furniture and floors dry out from too dry air, and in the future it turns out that the floors begin to creak and the furniture begins to fall apart. These installations will primarily maintain the required level of humidity in any room, regardless of the time of year.

Types of recuperators

In individual residential buildings Ventilation systems with centralized heat exchangers are most often installed. In addition, today you can choose from several types of recuperative ventilation designs, but the following are in higher demand:

1. Lamellar.
2. Rotary.
3. Chamber.
4. Having an intermediate coolant.

Plate type heat exchangers

The simplest designs for ventilation systems. The heat exchanger is made in the form of a chamber divided into separate channels located parallel to each other. Between them there is a thin plate partition, which has high thermal conductivity properties.

The principle of operation is based on the exchange of heat from air flows, that is, exhaust air, which is removed from the room and gives up its heat to the supply air, which enters the house already warm, thanks to this exchange.

The advantages of this technology include:

• easy device setup;
• complete absence of any moving parts;
• high efficiency actions.

Well, and one of the most significant drawback The operation of such a recuperator involves the formation of condensate on the plate itself. Typically, such heat exchangers require additional installation of special drop eliminators. This is a necessary parameter because winter time Condensation may freeze and stop the device. This is why in some devices of this type There are built-in defrosting systems.

Rotary heat exchangers

Here main detail takes over the rotor, which is located between the air ducts and heats the air through constant rotation. Ventilation with heat recovery rotor type has very high operating efficiency. This system allows you to return about 80% of the heat back into the room.

But a significant drawback is the inferior performance of the system regarding dirt, dust and odors. There are no densities in the design between the rotor and the housing. Because of them, air flows can mix and therefore all contaminants can come back again. And naturally, the noise level here is an order of magnitude higher than that of a plate heat exchanger.

Chamber type heat exchangers

In this type of recuperator, the air flows are separated directly by the chamber itself. Heat exchange occurs thanks to a damper that periodically changes the direction of air flow. This system is highly efficient in operation. The only disadvantage is the presence of moving parts inside the device.

Heat exchangers with intermediate media

Operating principle of this device almost similar to the operation of a plate recuperator. Here the heat exchanger is a closed loop of a tube. There is a constant circulation of water or a water-glycol solution in it. The efficiency of heat exchange processes directly depends on the circulation rate in a closed fluid circuit.

In such a device, mixing of air flows is completely eliminated. The only downside is the lack of efficiency. Such a device is capable of returning approximately 50% of the heat taken from the room.

Heat pipes

It is worth highlighting one more type of recuperator. Heat recovery in a home using heat pipes is quite effective. Such devices are sealed tubes made of metal that has high heat-conducting properties. Inside such a tube there is a liquid that has a very low boiling point (freon is usually used here).

Such a heat exchanger is always installed in a vertical position, with one of its ends located in the exhaust duct and the other in the supply duct.

The principle of operation is simple. The drawn out warm air, washing the pipe, transfers heat to the freon, which, boiling, moves upward with a large amount of heat. And the supply air washing the top of the tube takes this heat with it.

The advantages include high efficiency, quiet operation and high efficiency. So today you can save a lot on heating your home, paying some of it back.

From the dictionary of Latin words, recuperator (literally) means returning, receiving back.

In a supply and exhaust ventilation system, a recuperator is understood as a device that takes part of the heat from the exhaust air from the room and transfers it to the supply air, simultaneously heating or cooling it. Depends on the time of year.

Depending on the type of recuperator, the mixture of removed (let's call exhaust air) with fresh supply air may or may not be possible.

Types of recuperators:

• Lamellar;
• Tubular;
• Rotary;
• Ribbed

Let's look at the features of types using several examples.

The plate recuperator is the most common option used in ventilation systems. The prevalence is achieved by low manufacturing cost, simple design, simple installation. But it also has its drawbacks. This is the formation of condensation due to the temperature difference on the plates.

Recuperation is based on the passage of supply and exhaust air flows through the plates. At the same time, the flows do not mix, which ensures 100% freshness of the supply air into the serviced room. The picture below clearly shows the operating principle of such a recuperator.

The plate recuperator has found wide application in the system supply and exhaust ventilation consisting of several sections. Details about similar sectional installations we published information.

A tubular recuperator is rarely used in ventilation systems for large rooms. Most often used for ventilation of apartments with sealed plastic windows, and as Wikipedia suggests, in ECO houses.

Rotary recuperator.
It is a structure with a heat exchanger made of metal plates (usually aluminum) rotating inside. The heat exchanger rotates due to the flow of air, which is pumped by the supply and exhaust fan. Rotation can also be organized from an additional electric motor installed in the ventilation chamber. This type of recuperator usually has large size, but due to the higher efficiency compared to the plate one, it is advisable to use it in large rooms, halls and halls. On the positive side when using a rotary type of heat recovery, this minimizes the formation of condensation due to the meeting

The disadvantages include the rather high cost of this type of recuperator and the mixing of exhaust and supply air. For correct settings this type of recuperator is required highly qualified system customizers. Also, operating costs will be slightly higher due to the high consumption of electrical energy.

General diagram of the recuperator operation

Recuperator operation diagram general view looks like this.

The inlet air enters the heat exchanger where it meets the exhaust air. At low temperatures environment, due to the heated air from the room, the incoming air is partially heated. Further, if the heating is not enough, the air is heated by an electric heating element or a water heater (depending on the type of air handling unit) to a set value, for example 22 degrees, and then the heated air is supplied to the room.

According to experts, the heat recovery system allows you to save up to 32% of possible costs on electricity.
Also, optimal operation is achieved by proper control of the air handling unit as a whole. Typically, this function is performed by controllers for air handling units.
If your air supply unit equipped only with an electric heating element, we recommend paying attention to this one
If you plan to use all possible sections in organizing supply and exhaust ventilation, or each separately (recuperator, electric heating element, water heater), then you should pay special attention

On the eve of cold weather, the issue of keeping warm becomes relevant. Along with such standard measures as insulating the perimeter of the house, there are also more technologically advanced, and most importantly, less expensive methods. One of them is heat recovery.

RECOVERY EFFICIENCY

How well a solid exchange device copes with its task can be understood by such an indicator as the recovery efficiency coefficient. This value is the ratio between the maximum possible amount of heat that can be transferred to the supply air and that which is actually received. Depending on the device, the coefficient ranges from 30 to 95%.

ADVANTAGES AND DISADVANTAGES

Thanks to recovery, the amount of thermal energy required to heat a home is reduced. This means that the costs of generating this energy are also reduced. You can also save money on running your air conditioner in the summer. However, before a recovery-based air handling unit (AHU) begins to operate and pays off, it will require certain investments, which can be quite significant.
HOW DOES THIS WORK

Thermal energy recovery is a heat exchange process in which the cold air entering the room is heated by the warm air removed. Cooling recovery occurs in a similar way: warm incoming air masses transfer heat to the exhaust air exhausted outside and are thus cooled. To organize heat transfer, special devices are used - recuperators. Essentially, these are heat exchangers through which supply and exhaust air flows pass without mixing with each other.

USEFUL TIPS

THE FUNCTIONALITY OF A HEAT EXCHANGER can be broader than just cooling or heating air. Modern devices often equipped with cleaning filters, humidifiers, ionizers, noise suppression systems and other useful devices. But when purchasing such a device, you should be prepared for periodic replacement consumables, which will require additional costs.

SYSTEM COMPLETES. Rarely used in modern practice unified system ventilation of the whole house. It is much more profitable to divide rooms into groups according to the method of their use and design ventilation for each group separately. For example, if in two-story house in winter, it is planned to constantly use only the first floor; it is reasonable to plan a PES with recovery specifically for the first floor.

Types of recuperators

PLATE

A design of this type implies the presence in the heat exchanger of special wave-shaped plates made of sheet material that conducts heat well (aluminum, steel). Plates in the amount of 60-70 pieces are mounted in a single block (radiator) in such a way that the channels formed by the “wave” cross each other - to create turbulence, etc. accordingly, better heat transfer. The radiator is designed so that air masses of different temperatures do not mix with each other. The main disadvantage is the risk of freezing of the plates. Moisture is deposited on the walls of the mechanism, which is carried with it by the warm flow. If the temperature incoming air- very low, then ice may form at the outlet of the warm flow. Therefore, it is periodically necessary to let in cold supply air directly - that is, bypassing the recuperator, so that the exhaust air warm air defrosted the recuperator.

LIQUID

Consists of two heat exchangers connected to each other by a pipeline with a circulating liquid coolant. The latter is usually a solution of propylene glycol in distilled water. Heating up in the exhaust channel of the heat exchanger, the liquid transfers heat to the incoming air through the heat exchanger in the supply channel. The system does not freeze and is capable of serving large premises, however, it is rarely used in residential buildings due to its complexity and high cost.

ROTORY

In this modification, the rotor acts as a heat exchanger - a rotating cylinder made of corrugated steel. Heated up from exhaust air, the rotor, having completed half a revolution, transfers heat inflow. The advantage of the mechanism is that it is not at risk of freezing. Such a device does not need to be defrosted. therefore, its efficiency can reach 95 H. Disadvantage - it is difficult to avoid mixing air flows. In addition, the rotor partially transmits the odors that permeate the outgoing air.

How to choose a recuperator?

BUILT IN PVU

The best option is to initially design a ventilation system with a built-in recuperator. In this case, we are talking about purchasing a PES, the design of which already includes a heat exchanger. The main selection criterion is the productivity of the entire system as a whole (m³/h). It is calculated based on the total volume of air in the room and the air renewal rate. Calculating the volume of air is elementary; you need to multiply the area of ​​the house by the height of the ceilings (V = S × H). Brevity is chosen in accordance with the purpose of the room. For residential premises, it is enough for the air to be completely renewed once an hour. For the kitchen, bathroom and other rooms with different odors or high humidity the multiplicity should be increased.

NOT BUILT IN TO PVU

Sometimes the decision to purchase a recuperator arises after the ventilation has been completely installed. As a result, the task arises of selecting a device for a ready-made and current system air exchange.

When choosing, you should focus on the total volume of supply air that passes through all the fans to the heat exchanger. The performance of the unit must be 25 H less than this value, otherwise it will not work fully and may be useless.

In addition, you need to pay attention to the holes for connecting the air ducts. It is desirable that the dimensions and configuration of these holes be the same as those of the air channels in ventilation system Otherwise, problems with installing the device may occur.

USEFUL TIPS

PLATE RECOVERY RECOVERER

compared to rotary similar characteristics, as a rule, cheaper. In addition, it is more maintainable: it does not have complex moving mechanisms, and it is easy to fix it with your own hands. However, the risk of plate icing makes it less reliable in operation. When choosing such a unit, you should pay attention to models with a heat accumulator, which protects the device from the formation of ice.

ROTARY RECOVERY RECOVERER

Since the rotor comes into contact either with outgoing air containing contaminants or with fresh incoming air, the rotor will have to be cleaned and filters replaced more often. You should not install rotary heat exchangers for ventilation systems in rooms where strong odors are possible (kitchen, workshop).

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